Thanks for the info flippy and amber,
I think I'll always struggle to understand but I'm picking things up slowly and hopefully everything will work out safe and sound
flippy, I get what you're saying in your first paragraph and easier for me to remember, if I move onto another project I'll think about another MM but for what I use it for...
amber, the MM didn't register 8.40v (apart from out of the converter after I set it. The plug says 8.4v.
The test I did was to put the plug into the mains as normal but with bare wires touched MM connectors to wires and turned on
Based on what flippy said (if I got it right) the closest reading is 10.21 @ 20V DC but now I guessing that this is the unloaded voltage yeah?
If that's the case then would it been better to expose the wires but not disconnect the device so that I can test under load? and doing that would have given me 8.4v?